hey ?! Check youve got plenty of oil in the engine,How long ago since last service,Check condition of oil on the stick( dark,cloudy ,clear etc)How many ks since last service?Any on the floor?? (which I hope u dont) With my experience with the rollas as a service advisor at Toyota,engine discrepencies are next to nil but they do have a tendency for 'Valve slap' or noisy tappets,Youlle know if the oils topped up to capacity,If the oils low theres not enuff lubrication upstairs,So check the oil then thats cool,It may be valve slap,The easy fix is different oil viscosity & maybe a additive worse case is to shim the tappets or 'lash adjusters' good luck